Build (method = -2) #dp: 1627 Step-3' Graph: 65 vertices and 213 arcs (0.01s) Step-4' Graph: 24 vertices and 131 arcs (0.01s) #V4/#V3 = 0.37 #A4/#A3 = 0.62 Ready! (0.01s) Optimize a model with 82 rows, 132 columns and 352 nonzeros Presolve removed 51 rows and 59 columns Presolve time: 0.00s Presolved: 31 rows, 73 columns, 179 nonzeros Variable types: 0 continuous, 73 integer (13 binary) Found heuristic solution: objective 76.0000000 Found heuristic solution: objective 66.0000000 Found heuristic solution: objective 58.0000000 Optimize a model with 31 rows, 73 columns and 179 nonzeros Presolved: 31 rows, 73 columns, 179 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.900e+01 Factor NZ : 3.160e+02 Factor Ops : 4.296e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.23930817e+03 -1.02105584e+03 9.97e+01 2.22e-16 4.04e+01 0s 1 2.71254137e+02 -2.96460946e+02 1.15e+01 6.11e-16 5.72e+00 0s 2 8.24885341e+01 -5.89461071e+00 1.32e-01 3.77e-15 5.71e-01 0s 3 6.15899191e+01 3.33790377e+01 9.16e-04 6.66e-16 1.79e-01 0s 4 5.26334916e+01 4.94600724e+01 4.55e-05 4.44e-16 2.01e-02 0s 5 5.23455680e+01 5.16371715e+01 1.50e-05 4.44e-16 4.48e-03 0s 6 5.20012217e+01 5.19848019e+01 2.54e-07 2.22e-16 1.04e-04 0s 7 5.20000000e+01 5.20000000e+01 3.61e-13 2.90e-16 3.05e-10 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 5.20000000e+01 Root relaxation: objective 5.200000e+01, 33 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 52.0000000 52.00000 0.0% - 0s Explored 0 nodes (33 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.02 seconds Objective: 52 Solution: 1 x [58] 1 x [1, 58] 2 x [57] 2 x [2, 57] 2 x [4, 56] 1 x [3, 55] 1 x [7, 54] 1 x [6, 53] 3 x [5, 53] 1 x [8, 52] 1 x [51] 1 x [10, 50] 2 x [8, 49] 1 x [9, 48] 3 x [11, 47] 2 x [13, 46] 1 x [14, 45] 1 x [16, 44] 2 x [15, 43] 1 x [12, 42] 2 x [18, 41] 1 x [11, 41] 1 x [19, 40] 4 x [20, 39] 1 x [22, 38] 1 x [24, 37] 1 x [23, 36] 3 x [23, 35] 1 x [30, 34] 1 x [29, 33] 1 x [28, 32] 1 x [30, 31] 1 x [21, 27] 1 x [19, 26] 1 x [21, 25] 1 x [14, 17]